Neutral kaon mixing from 2+1 flavor Domain Wall QCD

Details Neutral kaon mixing from 2+1 flavor Domain Wall QCD Neutral kaon mixing from 2+1 flavor Domain Wall QCD

2007-02-05

arxiv.org/abs/hep-ph/0702042v4

Phys.Rev.Lett.100:032001,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures. RBC and UKQCD collaborations

Scientific paper

10.1103/PhysRevLett.100.032001

We present the first results for neutral kaon mixing using 2+1 flavors of domain wall fermions. A new approach is used to extrapolate to the physical up and down quark masses from our numerical studies with pion masses in the range 240 -- 420 MeV; only $SU(2)_L \times SU(2)_R$ chiral symmetry is assumed and the kaon is not assumed to be light. Our main result is $B_K^{\bar{\rm MS}}(2 \mathrm{GeV}) = 0.524(10)(28)$ where the first error is statistical and the second incorporates estimates for all systematic errors.

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